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Finding the Fourth Proportional to 1,396.69, 2,094.69 and 422.87

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Solution

The fourth proportional to 1,396.69, 2,094.69 and 422.87 is: 634.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.69 : 2,094.69 = 422.87 : x
  2. Step 2: Convert to fraction form
    1,396.69/2,094.69 = 422.87/x
  3. Step 3: Cross multiply
    1,396.69x = 2,094.69 × 422.87
  4. Step 4: Simplify right side
    1,396.69x = 885,781.56
  5. Step 5: Solve for x
    x = 885,781.56/1,396.69
  6. Step 6: Final answer
    x = 634.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.